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US4448913A - Fast crystallizing polyethylene terephthalate compositions - Google Patents

Fast crystallizing polyethylene terephthalate compositions Download PDF

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Publication number
US4448913A
US4448913A US06/437,651 US43765182A US4448913A US 4448913 A US4448913 A US 4448913A US 43765182 A US43765182 A US 43765182A US 4448913 A US4448913 A US 4448913A
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United States
Prior art keywords
poly
olefin
alpha
polyethylene terephthalate
composition
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Expired - Fee Related
Application number
US06/437,651
Inventor
Ernest A. Coleman
Kevin J. Cronin
Frank K. Chu
Robin W. Kirwan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AKZO PLASTICS BV A DUTCH CORP
WILSON-FIBERFIL HOLDINGS Inc A DE CORP
Saab AB
Original Assignee
Dart Industries Inc
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Assigned to DART INDUSRIES, INC. reassignment DART INDUSRIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CHU, FRANK KWANG-YU, CRONIN, KEVIN J., KIRWAN, ROBIN W., COLEMAN, ERNEST A.
Priority to US06/437,651 priority Critical patent/US4448913A/en
Priority to EP84302908A priority patent/EP0160138A1/en
Priority to IL71766A priority patent/IL71766A/en
Priority to AU27745/84A priority patent/AU560717B2/en
Priority to JP59094780A priority patent/JPS60240753A/en
Publication of US4448913A publication Critical patent/US4448913A/en
Application granted granted Critical
Assigned to PLASTIC SPECIALTIES AND TECHNOLOGIES, INC. reassignment PLASTIC SPECIALTIES AND TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DART INDUSTRIES, INC.
Assigned to SAAB-SCANIA AKTIEBOLAG reassignment SAAB-SCANIA AKTIEBOLAG ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ADLER, HORST F.
Assigned to WILSON-FIBERFIL HOLDINGS, INC., A DE. CORP. reassignment WILSON-FIBERFIL HOLDINGS, INC., A DE. CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PLASTIC SPECIALTIES AND TECHNOLOGIES, INC.,
Assigned to AKZO PLASTICS B.V., A DUTCH CORP. reassignment AKZO PLASTICS B.V., A DUTCH CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WILSON-FIBERFIL HOLDINGS, INC., A CORP. OF DE
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C08K5/098—Metal salts of carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds

Definitions

  • Polyethylene terephthalate and copolymers thereof are characterized by excellent physical properties which make them materials of great interest for use in films, fibers and molding applications. Reinforcing materials such as glass fibers are frequently incorporated in order to improve the mechanical properties of the final products prepared from polyethylene terephthalate.
  • the crystallization rate of polyethylene terephthalate homopolymers and copolymers per se and in molding compositions containing these polyesters can be improved by the addition of a poly-alpha olefin, particularly a low density polyethylene and sodium benzoate to polyethylene terephthalate and to compositions containing polyethylene terephthalate and its copolymers.
  • a poly-alpha olefin particularly a low density polyethylene and sodium benzoate
  • sodium benzoate as a nucleating agent in crystalline thermoplastics
  • it has been found that the addition of a crystallization rate promoter is required when sodium benzoate is employed in slowly crystallizing resins such polyethylene terephthalates and its copolymers.
  • poly-alpha-olefin and sodium benzoate can be added to polyethylene terephthalate molding compositions containing flame retardant additives providing a flame retardant polyethylene terephthalate composition of satisfactory properties.
  • compositions containing sodium benzoate, a poly-alpha-olefin, glass fibers and polyethylene terephthalate material can be prepared according to procedures known to those skilled in the art. However, it has been found most advantageous to dry blend the materials and extrude the resulting blend in order to mix and pelletize the blended composition.
  • the combination of low density polyethylene and sodium benzoate provides an effective promoter of the crystallization rate of polyethylene terephthalate and its copolymers thereby rendering polyethylene terephthalates utilizable over a wider range of conditions and applications.
  • the combination can be added to the polyethylene terephthalate at concentrations of from about 0.05% to about 0.5% of sodium benzoate and from about 1.5% to about 4.0% of a poly-alpha-olefin by weight of the total composition.
  • the poly-alpha-olefin and the sodium benzoate can be added per se to a polyethylene terephthalate composition.
  • a concentrate of these substances in polyethylene terephthalate can be prepared and added to polyethylene terephthalate compositions in an amount calculated to give the desired concentration in the final admixture.
  • the poly-alpha-olefin is added as a finely divided powder but pelletized poly-alpha-olefin can also be used.
  • flame retardant additives such as antimony trioxide in combination with halogenated organic compounds
  • halogenated organic compounds are Pyro-Chek 77PB, Pyro-Chek 68PB and Pyro-Chek 69PB.
  • additives including impact modifiers, such as copolyester polyether thermoplastic elastomers can also be employed in the composition of this invention.
  • the compounds were prepared in the following manner.
  • the polyethylene terephthalate was pre-dried for at least four hours in a desiccating hopper dryer at 250° F. All other ingredients were added to the polyethylene terephthalate and thoroughly admixed.
  • the admixtures were then extrusion compounded on a 11/2" Killion extruder equipped with a two-stage 28:1 L/D screw and pelletized.
  • the pelletized materials were then dried for a minimum of four hours at 250° F. in a circulating air tray drying oven. Table I lists typical extrusion conditions.
  • the dried compounds were then injection molded on a 1 oz., 28 ton Arburg injection molding machine.
  • a two cavity, parting line injection tool was used which had a 1/8" ⁇ 5" ⁇ 1/2" cavity (Standard ASTM flex bar) and a 3 mm ⁇ 127 mm ⁇ 12.7 mm cavity.
  • Table II identifies typical molding conditions used in the following examples.
  • a molding composition is prepared by admixing the following ingredients in the following proportions:
  • a molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
  • a flame retardant molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
  • a flame retardant molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
  • a molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
  • a molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
  • a molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
  • a molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
  • DSC Differential Scanning Calorimetry
  • the determination procedure is conducted as follows. Pellets of the composition are ground up to a fine particle size and approximately 5 mg of the resultant material is loaded into an aluminum pan and press closed. The pan is heated in a DuPont 990 Thermal Analyzer under nitrogen from room temperature to 285°-290° C. at 40° C./min. The temperature is held at 290° C. for 5 minutes and the aluminum pan pressed to insure good material contact. The sample is then cooled at 20° C./min. to 50° C. or less. It is then heated again under nitrogen at 20° C./min. to the melting point. As soon as base line is regained, cooling is begun at 20° C./min.
  • thermogram is generated during the latter heating and cooling cycle which records the melting temperature range of the compound as it is heated and the crystallization temperature range as the sample is cooled.
  • the difference between the peak melting temperature and the peak crystallization temperature is a measure of how rapidly a sample begins to recrystallize after melt. The smaller the difference ( ⁇ T), the more desirable the compound is as an injection molding resin.
  • unmodified 0.59 IV polyethylene terephthalate resin exhibits a ⁇ T of 60° thus any value below 60° C. represents an enhancement of the crystallization rate.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Polyethylene terephthalate molding compositions characterized by rapid crystallization are provided by combining polyethylene terephthalate and a filler or reinforcing agent with a crystallization-rate promoter comprising sodium benzoate and a poly-alpha-olefin such as low density polyethylene. A flame retardant material is provided by the addition of flame retardant additives.

Description

BACKGROUND OF THE INVENTION
Polyethylene terephthalate and copolymers thereof are characterized by excellent physical properties which make them materials of great interest for use in films, fibers and molding applications. Reinforcing materials such as glass fibers are frequently incorporated in order to improve the mechanical properties of the final products prepared from polyethylene terephthalate.
It has been found, however, that the relatively slow rate of crystallization of polyethylene terephthalate and the copolymers thereof greatly limits the use of such polyester composition in injection molding processes. Hence, a great deal of effort has been expended on the discovery of promoters which will accelerate the crystallization rate of polyethylene terephthalate and of its copolymers. Among the various patents which have issued on the accelerations of polyethylene terephthalate and which discuss the efforts of the prior art to overcome the crystallization rate disadvantages of these polyesters there may be mentioned U.S. Pat. Nos. 3,673,139; 4,098,845; 4,107,149; and 4,136,089. In addition, mention can be made of British Pat. No. 1,505,599 and German Pat. Nos. 2,545,720; 2,653,120; 2,706,123; 2,706,124; and 2,706,128. As is evident from these aforementioned patents, the efforts of the prior art have concentrated on the development of specific additives or promoters which will enhance the crystallization rates of polyethylene terephthalate homopolymers and copolymers. However, the rigorous demands of injection molding procedures and the economic factors involved in this field of technology are such that the provision of further means for enhancing the crystallization rates of such polyesters is constantly encouraged.
SUMMARY OF THE INVENTION
It has been found in accordance with the present invention that the crystallization rate of polyethylene terephthalate homopolymers and copolymers per se and in molding compositions containing these polyesters can be improved by the addition of a poly-alpha olefin, particularly a low density polyethylene and sodium benzoate to polyethylene terephthalate and to compositions containing polyethylene terephthalate and its copolymers. While the use of sodium benzoate as a nucleating agent in crystalline thermoplastics is known, it has been found that the addition of a crystallization rate promoter is required when sodium benzoate is employed in slowly crystallizing resins such polyethylene terephthalates and its copolymers. In particular, it has been found in accordance with the present invention that when sodium benzoate and low density polyethylene are added to a composition of polyethylene and fiberglass and extrusion compounded, a rapidly crystallizable composition is obtained which is eminently suitable for injection molding procedures.
In addition, it has been found that a poly-alpha-olefin and sodium benzoate can be added to polyethylene terephthalate molding compositions containing flame retardant additives providing a flame retardant polyethylene terephthalate composition of satisfactory properties.
The compositions containing sodium benzoate, a poly-alpha-olefin, glass fibers and polyethylene terephthalate material can be prepared according to procedures known to those skilled in the art. However, it has been found most advantageous to dry blend the materials and extrude the resulting blend in order to mix and pelletize the blended composition.
DETAILED DESCRIPTION OF THE INVENTION
In accordance with the present invention, it has been found that the combination of low density polyethylene and sodium benzoate provides an effective promoter of the crystallization rate of polyethylene terephthalate and its copolymers thereby rendering polyethylene terephthalates utilizable over a wider range of conditions and applications. The combination can be added to the polyethylene terephthalate at concentrations of from about 0.05% to about 0.5% of sodium benzoate and from about 1.5% to about 4.0% of a poly-alpha-olefin by weight of the total composition. However, it is preferred to add the sodium benzoate in amounts of from about 0.1% to about 0.3% and the poly-alpha-olefin in the amount of from about 2.0% to about 3.5%.
The poly-alpha-olefin and the sodium benzoate can be added per se to a polyethylene terephthalate composition. Alternatively, a concentrate of these substances in polyethylene terephthalate can be prepared and added to polyethylene terephthalate compositions in an amount calculated to give the desired concentration in the final admixture.
Preferably, the poly-alpha-olefin is added as a finely divided powder but pelletized poly-alpha-olefin can also be used.
In the preparation of flame retardant polyethylene terephthalates, the generally known flame retardant additives, such as antimony trioxide in combination with halogenated organic compounds, can be employed in the proportions recognized as appropriate in the art. Specific halogenated organic compounds are Pyro-Chek 77PB, Pyro-Chek 68PB and Pyro-Chek 69PB.
Other additives, including impact modifiers, such as copolyester polyether thermoplastic elastomers can also be employed in the composition of this invention.
In the general practice of the invention, the compounding of the ingredients is effected by extrusion. However, other means of compounding will suggest themselves to those skilled in the art and are within the comprehension of the present invention.
In the following examples components identified by trade names are chemically identified as follows:
Epon 828--bisphenol A--epichlorohydrin condensate resin--Shell Chemical
Poly-Eth 1017--branched low density polyethylene (MI 20)--Gulf
Acrawax C--ethylene bis-stearamide--Glyco Chemicals
Hytrel 5556--copolyester elastomer--DuPont
Pyro-Chek 68PB--brominated organic flame retardant--Ferro Corporation
Thermogard CPA--proprietary antimony compound--M & T Chemicals
Vituf 5900--polyethylene terephthalate with I.V. of 0.59--Goodyear
Profax 6323--stabilized polypropylene (MFR 12)--Hercules
LLDPE--linear low density polyethylene GRSN 7042 (MI 2.0)--Union Carbide Corp.
PB0400--polybutylene homopolymer (MI 20)--Shell Chemical
AC617A--polyethylene homopolymer wax--Allied Chemical.
In all of the examples, the compounds were prepared in the following manner. The polyethylene terephthalate was pre-dried for at least four hours in a desiccating hopper dryer at 250° F. All other ingredients were added to the polyethylene terephthalate and thoroughly admixed. The admixtures were then extrusion compounded on a 11/2" Killion extruder equipped with a two-stage 28:1 L/D screw and pelletized. The pelletized materials were then dried for a minimum of four hours at 250° F. in a circulating air tray drying oven. Table I lists typical extrusion conditions.
              TABLE I                                                     
______________________________________                                    
Typical Extrusion Compounding Conditions                                  
Temperature Settings                                                      
Zone 1                                                                    
      Zone 2   Zone 3  Zone 4 Die 1 Die 2  Die 3                          
______________________________________                                    
550° F.                                                            
      535° F.                                                      
               525° F.                                             
                       515° F.                                     
                              515° F.                              
                                    515° F.                        
                                           515° F.                 
Screw Speed: 90 rpm                                                       
                  Melt Temp.:  530-545° F.                         
______________________________________
The dried compounds were then injection molded on a 1 oz., 28 ton Arburg injection molding machine. A two cavity, parting line injection tool was used which had a 1/8"×5"×1/2" cavity (Standard ASTM flex bar) and a 3 mm×127 mm×12.7 mm cavity.
Table II identifies typical molding conditions used in the following examples.
              TABLE II                                                    
______________________________________                                    
Typical Molding Conditions (2 Cavity Flex Bar Mold)                       
Temperature Settings                                                      
______________________________________                                    
Zone 1   Zone 2        Zone 3  Mold                                       
______________________________________                                    
270° C.                                                            
         280° C.                                                   
                       290° C.                                     
                               125° C.                             
Injection Pressure:  350 psi                                              
                 Holding Pressure:  150 psi                               
Cycle Time (Automatic Cycle, sec.)                                        
Delay Inject                                                              
           Inject  Hold     Cooling                                       
                                   Die Open                               
______________________________________                                    
3.2        4.0     2.0      15.0   2.0                                    
______________________________________
The following examples are intended only to illustrate the invention and are not to be construed as limiting the invention.
EXAMPLE 1
A molding composition is prepared by admixing the following ingredients in the following proportions:
______________________________________                                    
             Percent by Weight                                            
______________________________________                                    
Vituf 5900     65.9                                                       
1/8" Glass Fibers                                                         
               30.0                                                       
Epon 828       1.0                                                        
Sodium Benzoate                                                           
               0.1                                                        
Poly-Eth 1017  3.0                                                        
______________________________________
When the above ingredients are thoroughly admixed, the mixture is extrusion compounded and molded according to the procedure previously outlined.
EXAMPLE 2
A molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
______________________________________                                    
             Percent by Weight                                            
______________________________________                                    
Vituf 5900     55.55                                                      
1/8" Glass Fibers                                                         
               30.00                                                      
Acrawax C      0.50                                                       
Epon 828       0.75                                                       
Sodium Benzoate                                                           
               0.20                                                       
Poly-Eth 1017  3.00                                                       
Hytrel 5556    10.00                                                      
______________________________________
The results of the test carried out on the flex bars made with formulations prepared in Examples 1 and 2 are set out in Table III below:
              TABLE III                                                   
______________________________________                                    
                       Example  Example                                   
               ASTM-D  1        2                                         
______________________________________                                    
Flexural Strength (× 10.sup.4 psi)                                  
                 790       3.48     2.99                                  
Flexural Modulus (× 10.sup.6 psi)                                   
                 790       1.46     1.21                                  
Unnotched Izod Impact                                                     
                 256       13.1     15.6                                  
(Ft-lb/in)                                                                
Notched Izod Impact                                                       
                 256       2.1      2.4                                   
(Ft-lb/in)                                                                
______________________________________
EXAMPLE 3
A flame retardant molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
______________________________________                                    
              Percent by Weight                                           
______________________________________                                    
Vituf 5900      50.6                                                      
1/8" Fiberglass 30.0                                                      
Epon 828        0.5                                                       
Sodium Benzoate 0.1                                                       
Poly-Eth 1017   3.0                                                       
Antimony Trioxide                                                         
                3.8                                                       
Pyro-Chek 68PB  11.5                                                      
Acrawax C       0.5                                                       
______________________________________
EXAMPLE 4
A flame retardant molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
______________________________________                                    
             Percent by Weight                                            
______________________________________                                    
Vituf 5900     50.6                                                       
1/8" Fiberglass                                                           
               30.0                                                       
Epon 828       0.5                                                        
Sodium Benzoate                                                           
               0.1                                                        
Poly-Eth 1017  3.0                                                        
Thermogard CPA 3.8                                                        
Pyro-Chek 68PB 11.5                                                       
Acrawax C      0.5                                                        
______________________________________
The results of the test carried out on the flex bars prepared from the compounds from Examples 3 and 4 are set out in Table IV below:
              TABLE IV                                                    
______________________________________                                    
                       Example  Example                                   
               ASTM-D  3        4                                         
______________________________________                                    
Flexural Strength (× 10.sup.4 psi)                                  
                 790       2.76     2.68                                  
Flexural Modulus (× 10.sup.6 psi)                                   
                 790       1.47     1.48                                  
Unnotched Izod Impact                                                     
                 256       9.4      9.6                                   
(Ft-lb/in)                                                                
Notched Izod Impact                                                       
                 256       1.6      1.7                                   
(Ft-lb/in)                                                                
Flammability Rating        V-O*     V-0*                                  
______________________________________                                    
 *1/32" Samples meet V0 requirements according to Underwriters Laboratorie
 Standard UL94.
EXAMPLE 5
A molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
______________________________________                                    
             Percent by Weight                                            
______________________________________                                    
Vituf 5900     65.4                                                       
1/8" Fiberglass                                                           
               30.0                                                       
Epon 828       1.0                                                        
Acrawax C      0.5                                                        
Sodium Benzoate                                                           
               0.1                                                        
Profax 6323    3.0                                                        
______________________________________
The results of tests carried out on the flex bars prepared from the compound in Example 5 are set out in Table V below:
              TABLE V                                                     
______________________________________                                    
                  ASTM-D Example 5                                        
______________________________________                                    
Flexural Strength (× 10.sup.4 psi)                                  
                    790      3.29                                         
Flexural Modulus (× 10.sup.6 psi)                                   
                    790      1.32                                         
Unnotched Izod Impact (Ft-lb/in)                                          
                    256      13.6                                         
Notched Izod Impact (Ft-lb/in)                                            
                    256      1.8                                          
______________________________________
EXAMPLE 6
A molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
______________________________________                                    
               Percent by Weight                                          
______________________________________                                    
Vituf 5900       65.55                                                    
1/8" Fiberglass  30.00                                                    
Epon 828         0.75                                                     
Acrawax C        0.50                                                     
Sodium Benzoate  0.20                                                     
PB 0400          3.00                                                     
Notched Izod (Ft-lb/in)                                                   
                 1.8                                                      
Unnotched Izod (Ft-lb/in)                                                 
                 11.7                                                     
______________________________________
EXAMPLE 7
A molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
______________________________________                                    
               Percent by Weight                                          
______________________________________                                    
Vituf 5900       65.55                                                    
1/8" Fiberglass  30.00                                                    
Epon 828         0.75                                                     
Acrawax C        0.50                                                     
Sodium Benzoate  0.20                                                     
LLDPE            3.00                                                     
Notched Izod (Ft-lb/in)                                                   
                 1.8                                                      
Unnotched Izod (Ft-lb/in)                                                 
                 13.8                                                     
______________________________________
EXAMPLE 8
A molding composition is prepared and molded according to the procedure in Example 1 using the following ingredients in the following proportions:
______________________________________                                    
               Percent by Weight                                          
______________________________________                                    
Vituf 5900       65.55                                                    
1/8" Fiberglass  30.00                                                    
Epon 828         0.75                                                     
Acrawax C        0.50                                                     
Sodium Benzoate  0.20                                                     
AC617A           3.00                                                     
Notched Izod (Ft-lb/in)                                                   
                 1.9                                                      
Unnotched Izod (Ft-lb/in)                                                 
                 8.2                                                      
______________________________________
In order to determine the relative rate of crystallization of the compositions of Examples 1-8, Differential Scanning Calorimetry (DSC) is used to record the difference between the peak melting temperature of the compound and peak crystallization temperature.
The determination procedure is conducted as follows. Pellets of the composition are ground up to a fine particle size and approximately 5 mg of the resultant material is loaded into an aluminum pan and press closed. The pan is heated in a DuPont 990 Thermal Analyzer under nitrogen from room temperature to 285°-290° C. at 40° C./min. The temperature is held at 290° C. for 5 minutes and the aluminum pan pressed to insure good material contact. The sample is then cooled at 20° C./min. to 50° C. or less. It is then heated again under nitrogen at 20° C./min. to the melting point. As soon as base line is regained, cooling is begun at 20° C./min. A thermogram is generated during the latter heating and cooling cycle which records the melting temperature range of the compound as it is heated and the crystallization temperature range as the sample is cooled. The difference between the peak melting temperature and the peak crystallization temperature is a measure of how rapidly a sample begins to recrystallize after melt. The smaller the difference (ΔT), the more desirable the compound is as an injection molding resin. As a point of reference, unmodified 0.59 IV polyethylene terephthalate resin exhibits a ΔT of 60° thus any value below 60° C. represents an enhancement of the crystallization rate.
The results of the determination procedure are set out in Table VI below.
              TABLE VI                                                    
______________________________________                                    
Composition of  DSC                                                       
Example No.     ΔT (° C.)                                    
______________________________________                                    
1               41                                                        
2               52                                                        
3               41                                                        
4               40                                                        
5               42                                                        
6               41                                                        
7               43                                                        
8               41                                                        
______________________________________

Claims (12)

We claim:
1. A composition consisting essentially of polyethylene terephthalate, sodium benzoate and a poly-alpha-olefin.
2. A composition according to claim 1 wherein the poly-alpha-olefin is low density polyethylene.
3. A composition according to claim 1 wherein the poly-alpha-olefin is polypropylene.
4. A composition consisting essentially of polyethylene terephthalate, sodium benzoate, a poly-alpha-olefin and fiberglass.
5. A composition according to claim 4 wherein the proportion of sodium benzoate to the total composition is from about 0.05% to about 0.5%, and the proportion of poly-alpha-olefin to the total composition is from about 1.5% to about 4.0%.
6. A composition according to claim 4 wherein the proportion of sodium benzoate to the total composition is from about 0.1% to about 0.3%, and the proportion of poly-alpha-olefin to the total composition is from about 2.0% to about 3.5%.
7. A composition according to claim 5 wherein the poly-alpha-olefin is low density polyethylene.
8. A composition according to claim 5 wherein the poly-alpha-olefin is polypropylene.
9. A composition according to claim 6 wherein a flame retardant additive is present.
10. A composition according to claim 6 wherein an impact modifier is present.
11. A composition according to claim 5 wherein the poly-alpha-olefin is selected from the group consisting of polyethylene, polypropylene, poly 1-butene, linear low density polyethylene and low molecular weight polyethylene wax.
12. A composition according to claim 11 in which there is also present an epoxy resin.
US06/437,651 1982-10-29 1982-10-29 Fast crystallizing polyethylene terephthalate compositions Expired - Fee Related US4448913A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US06/437,651 US4448913A (en) 1982-10-29 1982-10-29 Fast crystallizing polyethylene terephthalate compositions
EP84302908A EP0160138A1 (en) 1982-10-29 1984-04-30 Fast crystallizing polyethylene terephthalate compositions
IL71766A IL71766A (en) 1982-10-29 1984-05-04 Fast crystallizing polyethylene terephthalate compositions
AU27745/84A AU560717B2 (en) 1982-10-29 1984-05-07 Polyester composition
JP59094780A JPS60240753A (en) 1982-10-29 1984-05-14 Polyethylene terephthalate composition

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US4514465A (en) * 1984-05-30 1985-04-30 W. R. Grace & Co., Cryovac Div. Storm window film comprising at least five layers
US4548964A (en) * 1983-12-27 1985-10-22 Mitsubishi Rayon Co., Ltd. Flame-retardant polyester resin composition
US4564658A (en) * 1982-11-24 1986-01-14 General Electric Company Thermoplastic polyester-linear low density polyethylene molding compositions
US4590124A (en) * 1984-05-10 1986-05-20 W. R. Grace & Co., Cryovac Div. Storm window film
EP0184715A3 (en) * 1984-12-14 1987-12-02 EASTMAN KODAK COMPANY (a New Jersey corporation) Copolyester compositions
EP0295654A3 (en) * 1987-06-16 1989-04-26 Montefibre S.P.A. Fast-crystallizing polyester compositions
EP0360705A1 (en) * 1988-09-19 1990-03-28 EASTMAN KODAK COMPANY (a New Jersey corporation) Molding compositions based on poly(1,4-cyclohexylene dimethylene terephthalate) containing an amide crystallization aid
US5102943A (en) * 1990-12-04 1992-04-07 E. I. Du Pont De Nemours And Company Thermoformed articles with improved ease of cutting and resistance to sticking
EP0488711A3 (en) * 1990-11-29 1992-11-04 E.I. Du Pont De Nemours And Company Polyester resin composition
US5187216A (en) * 1991-04-18 1993-02-16 Eastman Kodak Company Process for the preparation of crystalline copolyesters
US5405921A (en) * 1993-02-03 1995-04-11 E. I. Du Pont De Nemours And Company Polyester compositions having improved optical properties and heat stability
US5506300A (en) * 1985-01-04 1996-04-09 Thoratec Laboratories Corporation Compositions that soften at predetermined temperatures and the method of making same
US6037063A (en) * 1993-09-07 2000-03-14 E. I. Du Pont De Nemours And Company High barrier, coextruded compositions useful in the manufacture of clear, heat-stable articles and methods relating thereto
US6281283B1 (en) 1998-03-21 2001-08-28 Basf Aktiengesellschaft Method for producing polyalkylene arylates
US20030205852A1 (en) * 2002-04-30 2003-11-06 Porter David Scott Polyester compositions

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US4859732A (en) * 1988-02-22 1989-08-22 Eastman Kodak Company Reinforced molding composition based on poly(1,4-cyclohexylene dimethylene terephthalate) having improved crystallization characteristics
ATE231532T1 (en) * 1993-10-22 2003-02-15 M & G Polimeri Italia Spa NUCLATION OF CRYSTALLIZATION OF POLYESTERS

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US3953394A (en) * 1971-11-15 1976-04-27 General Electric Company Polyester alloys and molding compositions containing the same
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US4284540A (en) * 1979-04-17 1981-08-18 Toray Industries, Inc. Polyethylene terephthalate molding compositions
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US4341690A (en) * 1980-10-31 1982-07-27 Eastman Kodak Company Stabilized polypropylene composition
US4336343A (en) * 1981-06-25 1982-06-22 Morris Township, Morris County Polyester molding compositions having increased crystallization temperatures

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564658A (en) * 1982-11-24 1986-01-14 General Electric Company Thermoplastic polyester-linear low density polyethylene molding compositions
US4548964A (en) * 1983-12-27 1985-10-22 Mitsubishi Rayon Co., Ltd. Flame-retardant polyester resin composition
US4590124A (en) * 1984-05-10 1986-05-20 W. R. Grace & Co., Cryovac Div. Storm window film
US4514465A (en) * 1984-05-30 1985-04-30 W. R. Grace & Co., Cryovac Div. Storm window film comprising at least five layers
EP0184715A3 (en) * 1984-12-14 1987-12-02 EASTMAN KODAK COMPANY (a New Jersey corporation) Copolyester compositions
US5506300A (en) * 1985-01-04 1996-04-09 Thoratec Laboratories Corporation Compositions that soften at predetermined temperatures and the method of making same
EP0295654A3 (en) * 1987-06-16 1989-04-26 Montefibre S.P.A. Fast-crystallizing polyester compositions
EP0360705A1 (en) * 1988-09-19 1990-03-28 EASTMAN KODAK COMPANY (a New Jersey corporation) Molding compositions based on poly(1,4-cyclohexylene dimethylene terephthalate) containing an amide crystallization aid
EP0488711A3 (en) * 1990-11-29 1992-11-04 E.I. Du Pont De Nemours And Company Polyester resin composition
EP0552520A1 (en) * 1990-12-04 1993-07-28 E.I. Du Pont De Nemours And Company Thermoformed articles with improved ease of cutting and resistance to sticking
AU643864B2 (en) * 1990-12-04 1993-11-25 E.I. Du Pont De Nemours And Company Thermoformed articles with improved ease of cutting and resistance to sticking
US5102943A (en) * 1990-12-04 1992-04-07 E. I. Du Pont De Nemours And Company Thermoformed articles with improved ease of cutting and resistance to sticking
US5187216A (en) * 1991-04-18 1993-02-16 Eastman Kodak Company Process for the preparation of crystalline copolyesters
US5405921A (en) * 1993-02-03 1995-04-11 E. I. Du Pont De Nemours And Company Polyester compositions having improved optical properties and heat stability
US6037063A (en) * 1993-09-07 2000-03-14 E. I. Du Pont De Nemours And Company High barrier, coextruded compositions useful in the manufacture of clear, heat-stable articles and methods relating thereto
US6281283B1 (en) 1998-03-21 2001-08-28 Basf Aktiengesellschaft Method for producing polyalkylene arylates
US20030205852A1 (en) * 2002-04-30 2003-11-06 Porter David Scott Polyester compositions
US6986864B2 (en) 2002-04-30 2006-01-17 David Scott Porter Polyester compositions

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AU560717B2 (en) 1987-04-16
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IL71766A (en) 1987-08-31
JPS60240753A (en) 1985-11-29

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